package com.lzp.badminton.util.loginUtil;

import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
 
/**
 * JSON工具类
 *  将json和对象互相转换
 * @author wulongwei
 *
 */
public class JsonUtils {
 
	// 定义jackson对象
 
	private static final ObjectMapper MAPPER = new ObjectMapper();
 
	/**
	 * 将对象转换成json字符串。
	 * 
	 * @param data
	 * @return
	 */
	public static String objectToJson(Object data) {
		try {
			String string = MAPPER.writeValueAsString(data);
			return string;
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		return null;
	}
 
	/**
	 * 将json结果集转化为对象
	 * 
	 * @param jsonData
	 * @param beanType
	 * @return
	 */
	public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
 
		try {
			T t = MAPPER.readValue(jsonData, beanType);
			return t;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
 
	/**
	 * 将json数据转换成pojo对象list
	 * 
	 * @param jsonData
	 * @param beanType
	 * @return
	 */
	public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {
 
		JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
		try {
			List<T> list = MAPPER.readValue(jsonData, javaType);
			return list;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
 
}